REPRODUCTION

Dr. Boonsatien Boonsoong

Department of ZoologyFaculty of ScienceKasetsart University

การสบืพันธุ

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Objectives

ทราบประเภทของการสืบพันธุ1

ทราบความแตกตางของการสืบพันธแบบอาศัยเพศ และไมอาศัยเพศ2

สามารถอธิบายขั้นตอน และลกัษณะสําคัญในแตละขั้นของการสรางเซลลสืบพันธุในพืช และสัตว3

ทราบกระบวนการในการรวมตัวกันของเซลลสืบพันธุในพืช และสัตว4

ทราบ และเขาใจหนาที่ของอวัยวะสืบพันธุแบบอาศัยเพศของพืช และสัตว5

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Mode of reproduction

Asexual reproductionresults in offspring that are genetically identical to the parent organism

Reproduction

Sexualreproductionresults in offspring that are genetically different from the parent organisms

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Asexual reproduction

• Euglena

• Fungi• Hydra

• Algae

Fission Fragmentation

Budding Sporulation

Asexualreproduction

Strawberry : runner plant

vegetative reproduction

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Asexual reproduction•Transverse binary fission: Paramecium

Fission

•Longitudinal binary fission: Elugena

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Asexual reproduction Budding

bud

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Asexual reproduction

Fragmentation Sporulation

sporangium

Oscillatoria

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Sexual reproduction

reproductive organ1

gametogenesis2

syngamy or fertilization3

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Structure of the flower

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Structure of Lily

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Life cycle of angiosperm

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Male reproductive organ

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Anther and pollen sac

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Microspore mother cell

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Microspore

tetrad microspore

diad microspore

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Female reproductive organ

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(2n) (n) (n) (n)

I II

meiosis

Megasporocyte(mother cell)

Megagametogenesis in angiosperm

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(n)8 nuclei 7 cells

Megagametogenesis in angiosperm

n n n

n

n nn n n

nnn

nn

nnnnnnn

n

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Double fertilization

Source: http://bcs.whfreeman.com/thelifewire/content/chp39/3902001.html

only in angiosperm

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EMBRYO & ENDOSPERM

Only Angiosperm

Sperm (n) + egg (n) → “embryo” (2n)

Sperm (n) + polar nuclei (2n) → “endosperm” (3n)

“Double fertilization”

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8 nuclei 7 cells

Megagametogenesis in Lilium sp.

3n 3n 3n

3n

3n 3n 3n3n 3n 3n

3nnn

nn

nnnnnnnn

nnn

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Lilium

Lilium ovary x.s. showing megasporocytes

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Lilium

Megasporogenesis: ovule with 2 integuments, encased megaspore mother cell

2n

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Lilium

Megasporogenesis: 2 free nuclei resulting from 1st meiotic division

n

n

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Lilium

Megasporogenesis: 4 free nuclei/4 megaspores resulting from 2nd meiotic division

n

n

nn

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Lilium

Megagametogenesis:migration of nuclei & fusion of 3 megaspores

3n

n

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Lilium

Megagametogenesis:3rd division after fusion of 3 megaspores

3n

n

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Lilium

Megasporogenesis: 2nd 4-nucleate stage (2 haploid + 2 triploid cells)

3n 3n

nn

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Lilium

Lilium embryo sac/female gametophyte, 8 nucleate

3n

3n 3n 3n

n

nnn

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Alternation of generation

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Alternation of generation

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Alternation of generation

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Spermatogenesis

Spermiogenesis

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Oogenesis

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Syngamy or Fertilization

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Structure of the flower

Hibiscus sp. (Malvaceae)

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Frog Anatomy

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Male Frog Anatomy

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Male Frog Anatomy

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Male Frog Anatomy

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Female Frog Anatomy

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Female Frog Anatomy

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Female Frog Anatomy

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Budding in yeast

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Vegetative reproduction

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Alternation of generation

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Structure of the flower

Hibiscus sp. (Malvaceae)

stigma

anther

filament

petalsepal pollen

style